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Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_vs_emit.c')
-rw-r--r--src/mesa/drivers/dri/i965/brw_vs_emit.c40
1 files changed, 24 insertions, 16 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vs_emit.c b/src/mesa/drivers/dri/i965/brw_vs_emit.c
index a22740084d..da9d3bacb0 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -797,13 +797,21 @@ static void emit_vertex_write( struct brw_vs_compile *c)
/* Build ndc coords? TODO: Shortcircuit when w is known to be one.
*/
- ndc = get_tmp(c);
- emit_math1(c, BRW_MATH_FUNCTION_INV, ndc, brw_swizzle1(pos, 3), BRW_MATH_PRECISION_FULL);
- brw_MUL(p, brw_writemask(ndc, WRITEMASK_XYZ), pos, ndc);
+ if (!c->key.know_w_is_one) {
+ ndc = get_tmp(c);
+ emit_math1(c, BRW_MATH_FUNCTION_INV, ndc, brw_swizzle1(pos, 3), BRW_MATH_PRECISION_FULL);
+ brw_MUL(p, brw_writemask(ndc, WRITEMASK_XYZ), pos, ndc);
+ }
+ else {
+ ndc = pos;
+ }
/* This includes the workaround for -ve rhw, so is no longer an
* optional step:
*/
+ if ((c->prog_data.outputs_written & (1<<VERT_RESULT_PSIZ)) ||
+ c->key.nr_userclip ||
+ !c->key.know_w_is_one)
{
struct brw_reg header1 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD);
GLuint i;
@@ -836,20 +844,17 @@ static void emit_vertex_write( struct brw_vs_compile *c)
* Later, clipping will detect ucp[6] and ensure the primitive is
* clipped against all fixed planes.
*/
- brw_CMP(p,
- vec8(brw_null_reg()),
- BRW_CONDITIONAL_L,
- brw_swizzle1(ndc, 3),
- brw_imm_f(0));
+ if (!c->key.know_w_is_one) {
+ brw_CMP(p,
+ vec8(brw_null_reg()),
+ BRW_CONDITIONAL_L,
+ brw_swizzle1(ndc, 3),
+ brw_imm_f(0));
- brw_OR(p, brw_writemask(header1, WRITEMASK_W), header1, brw_imm_ud(1<<6));
- brw_MOV(p, ndc, brw_imm_f(0));
- brw_set_predicate_control(p, BRW_PREDICATE_NONE);
-
-
-
-
-
+ brw_OR(p, brw_writemask(header1, WRITEMASK_W), header1, brw_imm_ud(1<<6));
+ brw_MOV(p, ndc, brw_imm_f(0));
+ brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+ }
brw_set_access_mode(p, BRW_ALIGN_1); /* why? */
brw_MOV(p, retype(brw_message_reg(1), BRW_REGISTER_TYPE_UD), header1);
@@ -857,6 +862,9 @@ static void emit_vertex_write( struct brw_vs_compile *c)
release_tmp(c, header1);
}
+ else {
+ brw_MOV(p, retype(brw_message_reg(1), BRW_REGISTER_TYPE_UD), brw_imm_ud(0));
+ }
/* Emit the (interleaved) headers for the two vertices - an 8-reg